c++ primer plus 习题5.8(5.9)（while(cin>>word),strcmp()）

#include <iostream>
#include <cstring>     // prototype for strcmp()
const int STR_LIM = 50;
int main()
{
    using namespace std;
    char word[STR_LIM];
    int count = 0;
    
    cout << "Enter words (to stop, type the word done):\n";
    
    while (cin >> word && strcmp("done", word))
        ++count;

    cout << "You entered a total of " << count << " words.\n";
    return 0; 
}

#include<iostream>
using namespace std;
int main(){
	string word;
	int count = 0;
    
    cout << "Enter words (to stop, type the word done):\n";
    
    while (cin >> word &&! (word=="done"))
        ++count;

    cout << "You entered a total of " << count << " words.\n";
    return 0; 
	
}